Seniority : the fact or state of being older or higher in rank or status than someone else.Juniority : for or denoting young or younger people.Urbanity : urban life.Posteriority: chiefly Anatomy further back in position, of or nearer the rear or hind end.Inferiority : the condition of being lower in status or quality than another or others.Superiority : excellence, eminence, transcendence, mastery.Then, the antonym of Superiority is Inferiority.